The Cisco QSFP-100G-SR4-S Compatible QSFP28 Optical Transceiver Module is designed for use in 100GBASE Ethernet throughput up to 100m over OM4 multimode fiber (MMF) using a wavelength of 850nm via a MTP/MPO-12 connector. This transceiver is compliant with IEEE 802.3bm 100GBASE-SR4 and CAUI-4 standard. Digital diagnostics functions are also available via the I2C interface, as specified by the QSFP28 MSA, to allow access to real-time operating parameters. With these features, this easy to install, hot swappable transceiver is suitable to be used in various applications, such as data centers, high-performance computing networks, enterprise core and distribution layer applications.

Designed for use in 100 Gigabit per second links over multi mode fiber, these modules are compliant with the QSFP28 MSA and IEEE 802.3bm. The optical transmitter portion incorporates a 4-channel VCSEL (Vertical Cavity Surface Emitting Laser) array, a 4-channel input buffer and laser driver, diagnostic monitors, control and bias blocks. For module control, the interface incorporates a Two Wire Serial (TWS) interface for real-time diagnostic monitoring of VCSEL bias, temperature, transmitted power, received power, and supply voltage.

Alarm and warning thresholds are established for monitored attributes, with flags and interrupts generated for out-of-threshold conditions, loss of signal (LOS), and transmitter faults. The optical receiver portion incorporates a 4-channel PIN photodiode array and TIA array for high-performance data recovery.